Considering it is about au$300 from Japan and was $200 at EB games the other month... I think this is pretty good if you get free shipping. And ordering today it should arrive on friday for the weekend.
They've always been listed on my orders as 'Due to arrive September 15th' and sure enough on the 16th they shipped.
Have you actually checked your Amazon account? Because I never received a shipping email for either Impactor or Mirage, but when I logged into Amazon it showed they had been posted on the 16th and are due to reach me at the end of this week.
Edit: OK, this is weird. Yesterday it said they were in transit and due to reach me on the 20th. Today its changed to 'Not Yet Shipped'. Wonder what is going on there
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Maybe Mirage went into stealth mode while in transit so that he can't be tracked...
I got a typically uninformed response from Amazon that the items were out of stock and would ship when available.
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Given that nobody has posted on Seibertron or TFW has posted that they found the figures at Walmart or US Target I'd guess the stock hasn't even entered the US yet.
SIEGE Spinger and Megs in stock at just under RRP.
I know some folks are still chasing these.